Tips - hotels, not typically. Although I did on a cruise I went on.
At restaurants I start at 15% most of the time, but I calculate differently than what is often shown on the receipt. I include the sales tax and use it as the base. So if I have a meal that comes to $23.45 including the sales tax (7.85% here at a restaurant, 6.85% most other places), that comes to $3.52 if using cash I might round one way or the other. ($3.50) If on a card it will be what the calculation comes to. (the way the register "suggestion" would be printed on the above meal ($21.61 x15% = $3.24) (20% would be $4.32) So it figures out using my method at a little over 16% (16.29% on the above) I rarely tip 20% or more, but at the same time I don't often go below 15%.
A buffet place might get a bit smaller tip. They aren't bringing my food, I am getting it. 15% will be top end most of the time, and I might go as low as 10% depending on service.
At restaurants I start at 15% most of the time, but I calculate differently than what is often shown on the receipt. I include the sales tax and use it as the base. So if I have a meal that comes to $23.45 including the sales tax (7.85% here at a restaurant, 6.85% most other places), that comes to $3.52 if using cash I might round one way or the other. ($3.50) If on a card it will be what the calculation comes to. (the way the register "suggestion" would be printed on the above meal ($21.61 x15% = $3.24) (20% would be $4.32) So it figures out using my method at a little over 16% (16.29% on the above) I rarely tip 20% or more, but at the same time I don't often go below 15%.
A buffet place might get a bit smaller tip. They aren't bringing my food, I am getting it. 15% will be top end most of the time, and I might go as low as 10% depending on service.